Quarterly report pursuant to Section 13 or 15(d)

Dispositions (Summarized Results of Discontinued Operations) (Details)

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Dispositions (Summarized Results of Discontinued Operations) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Income (loss) from discontinued operations $ 11 $ (162)   $ (52) $ 5,509
Discontinued Operations [Member] | Joint Operating With Republic Of Angola [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Gain on settlement of drilling obligation         (7,193)
General and administrative expense (recovery) (19) 206   61 220
Total operating costs, expenses and (recovery) (19) 206   61 (6,973)
Operating income (loss) 19 (206)   (61) 6,973
Total other income (expense) (5)     (5)  
Income (loss) from discontinued operations before income taxes 14 (206)   (66) 6,973
Income tax expense (benefit) 3 (44)   (14) 1,464
Income (loss) from discontinued operations $ 11 $ (162) $ 5,700 $ (52) $ 5,509